The utility model provides a cement jointing machine, the on -line screen storage device comprises a base. The casing is located just one end is uncovered on the base, and cement is arranged in in the cavity of casing, the jointing mouth is located on the casing and with the cavity intercommunication, the stirring wheel is located make in cement pours in the jointing mouth in order to be used for stirring cement in the cavity, driving motor locates on the base, be used for the drive the stirring wheel rotates. The utility model discloses a cement jointing machine can replace the manual seam operation of smearing, and is efficient, convenient to use.